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Finally holding up its own weight #2551038
09/17/18 01:39 PM
09/17/18 01:39 PM
Joined: Mar 2018
Posts: 52
Texas
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03heavy Offline OP
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03heavy  Offline OP
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Joined: Mar 2018
Posts: 52
Texas
Need some help with setting the pinion angle
Leaf springs (Caltrac’s)and a Transbrake

80868AC2-3744-481D-A59B-A22D8A347619.jpeg
Re: Finally holding up its own weight [Re: 03heavy] #2551039
09/17/18 01:41 PM
09/17/18 01:41 PM
Joined: Mar 2018
Posts: 52
Texas
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03heavy Offline OP
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03heavy  Offline OP
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Joined: Mar 2018
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Texas
Should have picture 🤷‍♂️🤷‍♂️🤷‍♂️

Re: Finally holding up its own weight [Re: 03heavy] #2551052
09/17/18 02:02 PM
09/17/18 02:02 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
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Posts: 43,007
Bend,OR USA
Call or contact Calvert for their advice on your car up scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Finally holding up its own weight [Re: 03heavy] #2551245
09/17/18 08:32 PM
09/17/18 08:32 PM
Joined: Jan 2003
Posts: 17,916
Akron, Ohio
ProSport Offline
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Akron, Ohio
Looks nice!


1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
Re: Finally holding up its own weight [Re: Cab_Burge] #2551256
09/17/18 09:02 PM
09/17/18 09:02 PM
Joined: Feb 2011
Posts: 1,454
Glendora Ca.
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Just-a-dart Offline
pro stock
Just-a-dart  Offline
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Glendora Ca.
Originally Posted By Cab_Burge
Call or contact Calvert for their advice on your car up scope


I agree with Cab. It is the wrong time of year for a pinion angle argument.(bad subject, beat to death....Goggle it)

Nice Duster!



"Just a Bracket car dressed up like a streetcar"
Re: Finally holding up its own weight [Re: 03heavy] #2551277
09/17/18 09:54 PM
09/17/18 09:54 PM
Joined: Oct 2007
Posts: 472
Minnesota, USA
humpty Offline
mopar
humpty  Offline
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Posts: 472
Minnesota, USA
What is the question?

Re: Finally holding up its own weight [Re: 03heavy] #2551313
09/17/18 11:23 PM
09/17/18 11:23 PM
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Texas
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03heavy Offline OP
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We suggest the pinion angle to be between 2 and 4 degrees negative at rest, as the pinion will climb 2-3 degrees at the launch, assuming the preload is roughly 1/4 turn
This is from Calvert

Re: Finally holding up its own weight [Re: 03heavy] #2551501
09/18/18 02:01 PM
09/18/18 02:01 PM
Joined: Nov 2010
Posts: 1,397
Carson City, Nevada
Biginchmopar Offline
pro stock
Biginchmopar  Offline
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Posts: 1,397
Carson City, Nevada
Originally Posted By 03heavy
We suggest the pinion angle to be between 2 and 4 degrees negative at rest, as the pinion will climb 2-3 degrees at the launch, assuming the preload is roughly 1/4 turn
This is from Calvert

Sounds right to me, I would go to 4 degrees negative to start.
What is your power level?
What type of trans?

Re: Finally holding up its own weight [Re: 03heavy] #2551506
09/18/18 02:17 PM
09/18/18 02:17 PM
Joined: Nov 2007
Posts: 21,808
Kirkland, Washington
Pacnorthcuda Offline
Too Many Posts
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Kirkland, Washington
Calvert has answered this MANY times. 2-4 degrees down, with stated preload. You will be able to adjust preload without worrying about its effect on angle (within reason) at this setting.

Think about it...4 degrees down without bars, on a leaf spring set up works well, and the Caltracs limit spring wrap up..makes sense.

Re: Finally holding up its own weight [Re: 03heavy] #2551541
09/18/18 03:10 PM
09/18/18 03:10 PM
Joined: Mar 2018
Posts: 52
Texas
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03heavy Offline OP
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Texas
This was directed towards the guys using a Transbrake and a 3 speed
And trying to leave hard off the brake which I thought was a common setup
But after digging around most of the guys I found to be using the Caltrac’s
Are footbraking
I was just seeing how the fast guys do it
Thanks for the reply’s folks

Last edited by 03heavy; 09/18/18 03:11 PM.
Re: Finally holding up its own weight [Re: 03heavy] #2551545
09/18/18 03:14 PM
09/18/18 03:14 PM
Joined: Dec 2012
Posts: 1,823
Wind Gap,Pa.
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Sammy Offline
top fuel
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Joined: Dec 2012
Posts: 1,823
Wind Gap,Pa.
5-6 degrees down is what I have been doing for years. That rear does move quite a bit

Re: Finally holding up its own weight [Re: 03heavy] #2551547
09/18/18 03:26 PM
09/18/18 03:26 PM
Joined: Oct 2007
Posts: 472
Minnesota, USA
humpty Offline
mopar
humpty  Offline
mopar

Joined: Oct 2007
Posts: 472
Minnesota, USA
I wouldn't consider our car fast, but we're at -5 degrees launching a low gear 904 at 3500rpm off the transbrake on 275 Drag Radials, 3165lbs at the line with 4.30's. The biggest issue with the transbrake has been controlling the hit to keep the tires planted. Menscer fixed the issue with shock valving.

That is a beautiful A body!







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